WO2007043108A1 - Système et procédé de communication sans fil - Google Patents

Système et procédé de communication sans fil Download PDF

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Publication number
WO2007043108A1
WO2007043108A1 PCT/JP2005/018139 JP2005018139W WO2007043108A1 WO 2007043108 A1 WO2007043108 A1 WO 2007043108A1 JP 2005018139 W JP2005018139 W JP 2005018139W WO 2007043108 A1 WO2007043108 A1 WO 2007043108A1
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WO
WIPO (PCT)
Prior art keywords
subcarrier
wireless communication
communication system
resource
subcarriers
Prior art date
Application number
PCT/JP2005/018139
Other languages
English (en)
Japanese (ja)
Inventor
Taisei Suemitsu
Kuniyuki Suzuki
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to EP05788284A priority Critical patent/EP1940059A4/fr
Priority to PCT/JP2005/018139 priority patent/WO2007043108A1/fr
Priority to CN200580051734.1A priority patent/CN101273565B/zh
Priority to JP2007539732A priority patent/JP4602409B2/ja
Priority to US12/065,968 priority patent/US9065596B2/en
Publication of WO2007043108A1 publication Critical patent/WO2007043108A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Definitions

  • the present invention relates to a wireless communication system and a wireless communication method, and more particularly to a technique for simplifying the device configuration.
  • a mobile station asks a base station for permission of data transmission using a contention channel prior to data transmission, and grants permission. After obtaining, subcarriers are captured.
  • the contention channel in order to avoid collision between contention data transmitted from multiple mobile stations, the time slot to be used is divided for each mobile station, and the contention data is a preamble.
  • a method of transmitting the message part after confirming that radio resources are free by receiving ACKZ NACK, etc. as a response to the preamble part as a response to the preamble part (W-CDMA system) is considered. ing.
  • W-CDMA system Wideband Code Division Multiple Access
  • Patent Document 1 discloses a method for dividing a data message for each OFDM tone and further dividing a time slot for reception in order to avoid collision between contention data in which a plurality of mobile station forces are also transmitted. Is disclosed.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2001-211189
  • Non-Patent Document 1 Supervised by Keiji Tachikawa, “W—CDMA mobile communication system”, Maruzen Co., Ltd., June 2001, ⁇ . 130-134
  • contention data is divided into a preamplifier part and a message part. Since the control becomes complicated by dividing it into two, there is a problem that the device configuration becomes complicated.
  • the present invention has been made to solve these problems, and an object of the present invention is to provide a radio communication system and a radio communication method capable of easily reducing the contention channel collision rate. .
  • a first aspect of a radio communication system is a radio communication system capable of performing a plurality of radio communications using a plurality of radio resources, wherein one radio communication and another radio communication are performed.
  • the order in which radio resources are allocated differs between radio communications.
  • contention channel collisions can be easily reduced.
  • a second aspect of the radio communication system according to the present invention is a radio communication system capable of performing a plurality of radio communications using a plurality of subcarriers, and as a subcarrier used for one radio communication. Of these subcarriers, those with relatively high communication quality are preferentially used.
  • contention channel collisions can be easily reduced.
  • a third aspect of the radio communication system is a radio communication system capable of performing a plurality of radio communications using a subcarrier sequence in which a plurality of subcarriers are arranged in a frequency region. Then, a resource subcarrier sequence in which resource subcarriers used as radio resources for one radio communication are arranged in the frequency domain is designated based on a predetermined parameter group and a predetermined arithmetic expression.
  • a fourth aspect of the wireless communication system is a wireless communication system capable of performing a plurality of wireless communications using a subcarrier sequence in which a plurality of subcarriers are arranged in a frequency domain.
  • the resource subcarrier sequences in which the resource subcarriers used as radio resources for one radio communication are arranged in the frequency domain are the second resource subcarriers having subcarrier powers having different bandwidths. It comprises a carrier train and a third resource subcarrier train.
  • a first aspect of a wireless communication method uses a plurality of radio resources and a plurality of radio resources.
  • wireless communication can be performed, and the order in which wireless resources are allocated differs between one wireless communication and another wireless communication.
  • contention channel collisions can be easily reduced.
  • a second aspect of the radio communication method according to the present invention is a radio communication method capable of performing a plurality of radio communications using a plurality of subcarriers, as a subcarrier used for one radio communication. Of these subcarriers, those with relatively high communication quality are preferentially used.
  • contention channel collisions can be easily reduced.
  • a third aspect of the wireless communication method according to the present invention is a wireless communication method capable of performing a plurality of wireless communications using a subcarrier sequence in which a plurality of subcarriers are arranged in a frequency domain.
  • a resource subcarrier string in which resource subcarriers used as radio resources for one radio communication are arranged in the frequency domain is designated based on a predetermined parameter group and a predetermined arithmetic expression.
  • a fourth aspect of the wireless communication method according to the present invention is a wireless communication method capable of performing a plurality of wireless communications using a subcarrier sequence in which a plurality of subcarriers are arranged in a frequency domain.
  • the resource subcarrier sequence in which the resource subcarriers used as radio resources for one radio communication are arranged in the frequency domain is the second resource subcarrier sequence and the second resource subcarrier sequence each having a subcarrier power having a different bandwidth. It comprises 3 resource subcarrier trains.
  • communication can be performed while reducing interference.
  • FIG. 1 is a diagram showing a frequency band in a radio communication system according to a first embodiment.
  • FIG. 2 is a diagram showing priorities in the radio communication system according to the first embodiment.
  • FIG. 3 is a diagram showing a frequency band in the radio communication system according to the first embodiment.
  • FIG. 4 is a block diagram showing functions of a base station in the wireless communication system according to the first embodiment.
  • FIG. 5 is a block diagram showing functions of a mobile station in the wireless communication system according to the first embodiment.
  • FIG. 6 is a block diagram showing functions of a demodulation unit in the wireless communication system according to the first embodiment.
  • FIG. 7 is a diagram showing subcarrier priorities in the radio communication system according to the first embodiment.
  • FIG. 8 is a diagram showing subcarrier priorities in the radio communication system according to the first embodiment.
  • FIG. 9 is a diagram showing subcarrier priorities in the radio communication system according to the first embodiment.
  • FIG. 10 is a block diagram showing functions of a base station in the wireless communication system according to the first embodiment.
  • FIG. 11 is a diagram showing subcarrier allocation in the radio communication system according to Embodiment 2.
  • FIG. 12 is a diagram showing subcarrier allocation in the radio communication system according to Embodiment 2.
  • FIG. 13 is a diagram showing subcarrier allocation in the radio communication system according to Embodiment 2.
  • FIG. 14 is a block diagram showing functions of a base station in the wireless communication system according to the second embodiment.
  • FIG. 15 is a flowchart showing an operation of the base station according to the second embodiment.
  • FIG. 16 is a block diagram showing functions of a base station in the wireless communication system according to the third embodiment.
  • FIG. 17 is a block diagram showing a channel arrangement in the radio communication system according to the third embodiment.
  • FIG. 18 is a diagram showing a first aspect of subcarrier designation in the wireless communication system according to the third embodiment.
  • FIG. 19 is a diagram showing a second aspect of subcarrier designation in the wireless communication system according to the third embodiment.
  • FIG. 20 is a diagram showing a third aspect of subcarrier designation in the wireless communication system according to the third embodiment.
  • FIG. 21 is a diagram showing designation of subcarriers in the wireless communication system according to the fourth embodiment.
  • FIG. 22 is a block diagram showing functions of a base station in the wireless communication system according to the fourth embodiment.
  • FIG. 23 is a block diagram showing functions of a base station in the wireless communication system according to the fourth embodiment.
  • a subcarrier in FDM (including OFDM) is mainly used as a radio resource for each of a plurality of mobile stations to perform one-to-one radio communication with a base station
  • the radio resources are not limited to subcarriers in FDM, but may be, for example, time slots in TDM or codes in CDMA! / ⁇ .
  • FIGS. 1 and 2 are schematic diagrams illustrating the operation (wireless communication method) of the wireless communication system according to the first embodiment.
  • FIG. 1 shows a case where subcarriers fl to f8 are frequency bands in the FDM system. These subcarriers fl to f8 are allocated by a single base station to a plurality of mobile stations subordinate to this base station.
  • each of the subcarriers fn (n: integer) has a unique subcarrier number n, and the subcarrier numbers are in ascending order from the low frequency to the high frequency in the frequency domain. It shall be attached.
  • FIG. 2 when a plurality of mobile stations are classified into two types of user groups A and B, The priorities for assigning subcarriers fl to f8 to user groups A and B are shown. Classification into user groups A and B is performed based on information such as the user ID and telephone number unique to the mobile station. The priority shown in Fig. 2 is higher for smaller numbers.
  • the assignment priority to user group A decreases in the order of subcarriers fl to f8 (that is, as the frequency increases), and the assignment priority to user group B is subcarrier fl to f8. It is getting higher in order. In this way, by assigning subcarriers f1 to f8 so that the priorities of user groups A and B are different, the contention channel collision rate that occurs when transmitting mobile station contention data is reduced. It becomes possible to do.
  • the force described for the case where the subcarriers fl to f8 are determined by the FDM system as shown in FIG. 1 is not limited to this.
  • the FDM system as shown in FIG. 1
  • adjacent subcarriers may be overlapped because they are orthogonal to each other.
  • How to determine the frequency band of each of subcarriers fl to f8 is reported to the base station power mobile station using a broadcast channel or the like. That is, the mobile station determines which frequency band to use to transmit contention data based on the broadcast channel and allocation priority notified from the base station.
  • FIG. 4 is a block diagram showing functions of base station 100 in the radio communication system according to the present embodiment.
  • FIG. 5 shows a mobile station 20 in the radio communication system according to the present embodiment. It is a block diagram which shows the function of 0.
  • the base station 100 includes a user distribution unit 10, an assignment priority instruction unit 20, a control information generation unit 30, a modulation unit 40, an RF unit 50, and an antenna 60. And a demodulator 70 and a wired I / F 80.
  • the mobile station 200 includes an antenna 110, an RF unit 120, a demodulation unit 130, a message analysis unit 140, an application unit 150, a data amount determination unit 160, and a radio resource allocation unit 170. And a modulation unit 180.
  • the user distribution unit 10 classifies each user (that is, each mobile station 200).
  • the allocation priority instruction unit 20 determines the priority with which each radio resource is allocated to the user groups A and B classified in the user distribution unit 10 and determines the priority information as a control information generation unit. Notify 30.
  • the control information generating unit 30 generates the priority information notified from the allocation priority instructing unit 20 as control information in a radio format, and inputs the control information to the modulating unit 40.
  • the modulation unit 40 performs predetermined modulation processing (DA conversion or the like) on the control information input from the control information generation unit 30 and inputs the control information to the RF unit 50.
  • the RF unit 50 up-converts the control information input from the modulation unit 40 to a radio frequency by a built-in up-conversion unit (not shown in FIG. 4), and then transmits the control information from the antenna 60 to the mobile station 200.
  • application section 150 In mobile station 200 shown in FIG. 5, application section 150 generates application data to be transmitted to base station 100, such as mail, voice, and image.
  • the data amount determination unit 160 determines the data amount of contention data to be transmitted to the base station 100 through the contention channel according to the data amount of the application data generated by the application unit 150, and stores the contention data. Input to the radio resource allocation unit 170.
  • mobile station 200 sets an upper limit on the amount of data to be transmitted in consideration of the amount of power that can be used. It is preferable to keep it.
  • RF section 120 receives control information transmitted from base station 100 from antenna 110, down-converts it to an analog baseband signal, and then inputs it to demodulation section 130.
  • the demodulation unit 130 performs predetermined demodulation processing (AD conversion or the like) on the control information input from the RF unit 120 and inputs the control information to the message analysis unit 140.
  • Message analysis unit 140 is demodulator 130
  • Priority information is extracted by analyzing the control information input from the wireless resource allocation unit 170 and input to the radio resource allocation unit 170.
  • Radio resource allocation section 170 allocates contention data input from data amount determination section 160 to a predetermined radio resource as a contention channel based on priority information input from message analysis section 140, and modulates section 180. To input.
  • Modulation section 180 performs predetermined modulation processing (DA conversion or the like) on the contention data input from radio resource allocation section 170 and causes RF data to be input to RF section 120.
  • the RF unit 120 up-converts the contention data input from the modulation unit 180 to a radio frequency, and then transmits the content data from the antenna 110 to the base station 100.
  • the RF unit 50 receives contention data transmitted from the mobile station 200 from the antenna 60, and performs analog processing with a built-in down-conversion unit (not shown in FIG. 4). After down-converting to baseband signal, input to demodulator 70.
  • the demodulator 70 performs predetermined demodulation processing (AD conversion or the like) on the contention data input from the RF unit 50, and inputs the content data from the wired IZF 80 to the host device controlling the base station 100.
  • FIG. 6 is a block diagram showing the function of the demodulator 70 when subcarriers in the OFDM scheme are used as radio resources.
  • the serial data input to the serial Z parallel conversion unit 71 is converted into parallel data and input to the FFT (Fast Fourier Transform) unit 72.
  • the FFT unit 72 performs a predetermined demodulation process by performing FFT on the parallel data input from the serial Z parallel conversion unit 71, and outputs the result as a plurality of radio resources R (1) to R (N).
  • the predetermined demodulation process is not limited to FFT, but may be DFT (Discrete Fourier Transform).
  • control can be simplified compared to the W-CDMA scheme shown in Non-Patent Document 1, so that the apparatus configuration can be simplified. That is, mobile station 200 can omit the exchange of dividing the contention channel into a preamble part and a message part and transmitting the message part for the first time after receiving an ACK for the preamble part from base station 100. In other words, in the contention channel, the preamble part can be omitted and only the message part can be configured.
  • the contention channel is set to RACH (pre- The mobile station 200 transmits the RACH (message) after confirming with the RACH (preamble) that the radio resources of the base station 100 are available. .
  • contention data can be a fixed length, variable force length, so that radio resources can be used effectively.
  • each of the user groups A to D two subcarriers (calculated as the quotients) are assigned with the highest priority (priority is 1 to 2). That is, the user group A is in subcarriers 1-2, user group B is in subcarriers 3-4, user group C is in subcarriers 5-6, and user group D power is maximum in subcarriers 7-8. Priority.
  • the priority levels of the user groups B to D are determined in the subcarriers 1 to 2 where the user group A has the highest priority.
  • the priority of user groups B to D (6 to 8) in subcarrier 1 with a relatively high priority of user group A is 1, and the priority of user group A is 2 and relatively low.
  • priorities of user groups A and C to D are determined in subcarriers 3 to 4 where user group B has the highest priority, and user groups A are determined to subcarriers 5 to 6 in which user group C has the highest priority.
  • Priority of ⁇ B, D is determined, and priority of user groups A ⁇ C is determined in subcarriers 7 ⁇ 8 where user group D has the highest priority.
  • Priorities among the user groups B to D are determined based on a predetermined rule so as to be equal as a whole.
  • the subcarriers 1 to 2 are set to have higher priority in the order of user groups B, C, and D, and the subcarriers 3 to 4 have higher priority in the order of user groups C, D, and A.
  • priority is set in the order of user groups D, A, B, and in subcarriers 7-8, priority is increased in the order of user groups A, B, C. It is determined as follows.
  • the power TDMA method and the C DMA method described in FIG. 7 are used when the radio resource is a subcarrier, that is, in the case of the FDM method (including the OFDM method).
  • this embodiment can be applied. In other words, this embodiment can be applied by substituting the subcarrier number shown in FIG. 7 for the TDMA system !, for the time slot number, and for the CDMA system by the code number. .
  • priorities 1 to 2 are assigned to subcarriers adjacent to each other in the frequency domain (for example, in user group A, each priority is assigned to each other in the frequency domain).
  • Priorities 1 and 2 may be assigned to subcarriers that are not adjacent to each other in the frequency domain (for example, in user group A, subcarriers 1 and 5 that are not adjacent to each other in the frequency domain have priority levels 1 and 2 respectively. Assigned).
  • the subcarriers assigned priority levels 1 to 2 are occupied when the user group transmits one contention data, but they must be assigned to separate frequency bands that are not adjacent to each other. Thus, it is possible to effectively use the multi-carrier method and reduce frequency fading.
  • the data amount determination unit 160 should transmit to the base station 100.
  • the case of determining the amount of tension data has been described.
  • the present invention is not limited to this, and as described below, the amount of contention data to be transmitted from the mobile station 200 to the base station 100 is determined by the contention channel of the contention channel by the base station 100 measuring the contention channel. The mobile station 200 may be notified after checking the availability.
  • FIG. 10 is a block diagram showing functions of base station 100a in the radio communication system according to the present embodiment.
  • FIG. 10 shows a contention channel measuring unit 90 provided between the control information generating unit 30 and the demodulating unit 70 in FIG.
  • the contention channel measurement unit 90 confirms the availability by measuring the communication quality of the transmission path in the contention data input from the demodulation unit 70, and notifies the control information generation unit 30 as the availability information.
  • the contention channel can be measured by the following method.
  • the electric field strength (RS SI) may be measured, or the usage status of the code number may be measured.
  • the ratio of the number of time slots used as contention channels to the total number of time slots allocated as contention channels may be measured, or the time slot number
  • the availability may be measured.
  • the ratio of the number of subcarriers used as contention channels to the total number of subcarriers assigned as contention channels is measured.
  • Check availability of sub-carrier number SiJ can be determined.
  • the control information generation unit 30 generates the empty information notified from the contention channel measurement unit 90 as control information in a wireless format, and inputs it to the modulation unit 40.
  • the quality of this control information can be improved by performing error correction coding or performing repeated transmission as necessary when transmitting to the mobile station 200.
  • this control information can be represented by the nearest discrete value to reduce the amount of data to be transmitted.
  • the demodulation processing in the mobile station 200 is simplified by assigning the control information to a predetermined code that is commonly used in each mobile station 200 using the contention channel. It can be. Also, by transmitting this control information as layer 1 (physical layer) data, the delay can be reduced.
  • a predetermined time slot is used instead of the predetermined code
  • a predetermined subcarrier is used instead of the predetermined code.
  • message analysis section 140 extracts control information by analyzing the control information, and inputs it to radio resource allocation section 170.
  • the radio resource allocation unit 170 allocates the contention data input from the data amount determination unit 160 to a predetermined radio resource as a contention channel based on the empty information input from the message analysis unit 140.
  • radio resource allocating section 170 refers to the vacant information, and allocates content data to be transmitted to vacant radio resources while adjusting the data amount. As a result, the collision rate of the contention channel can be reduced.
  • the maximum data amount may be determined in consideration of the reception capability of the base station 100.
  • TDMA it is used as a contention channel for the total number of time slots allocated as contention channels. Determine the maximum amount of data taking into account the percentage of time slots!
  • FDM scheme is! / Is the OFDM scheme
  • the ratio of the number of subcarriers used as contention channels to the total number of subcarriers allocated as contention channels The maximum data amount may be determined in consideration. If allocation to radio resources is difficult even after adjusting the above data amount, it is possible to further reduce the contention channel collision rate by canceling transmission.
  • the wireless communication system and the wireless communication method according to the present embodiment! Therefore, a plurality of subcarriers are allocated to a plurality of user groups so that the priorities are different from each other. Therefore, the collision rate of the contention channel can be reduced. Compared to the W-CDMA system, this eliminates the need to divide contention data into a preamble part and a message part, or to receive it in a base station standard time slot, thus simplifying the equipment configuration. It can be.
  • the amount of data varies with time, such as packet data for Web browsing. Or handling multiple types of buckets with different data sizes.
  • the mobile station uses DPCCH to constantly transmit a signal composed of a preamble part for demodulation and optimization of transmission power. According to the present embodiment, such a signal Therefore, the power used in the mobile station can be reduced.
  • the power described in the case of using the multicarrier system (FDM system or OFDM system), the CDMA system, and the TDMA system alone is not limited to this. In that case, the above-described method may be used in combination.
  • the setting of the priority of the radio resource allocated to the user group as described above is applicable not only when the base station 100 uses the multicarrier scheme but also when the mobile station 200 uses the multicarrier scheme. (The same applies to the second and subsequent embodiments).
  • the power described in the case where the priority of radio resources is assigned in the contention channel is not limited to the contention channel, and may be applied to other channels (Embodiment 2). And so on)
  • a subcarrier in a multicarrier scheme has transmission path characteristics depending on the frequency. Therefore, such transmission path characteristics may be taken into account when subcarriers are allocated as radio resources.
  • FIG. 11 is a diagram showing subcarrier allocation in the radio communication system according to Embodiment 2.
  • bands 310 and 330 have a high communication quality (reception sensitivity), and band 320 has a low communication quality.
  • it is possible to improve communication quality by preferentially using the bands 310 and 330 as radio resources (assigning the subcarrier sequences 340 and 350, respectively) compared to the band 320.
  • a plurality of subcarriers arranged at equal intervals in the frequency domain is referred to as a (simply) subcarrier sequence.
  • the above transmission path characteristics are estimated by, for example, measuring communication quality using the average value of all contention channels received from the mobile station 200 for each band of a predetermined width in the base station 100. it can.
  • the above transmission path characteristics correspond to a known sequence signal (for example, a pilot signal in the W-CDMA method) included in the contention data in the base station 100.
  • the measured known series signal can be estimated by obtaining the phase difference in the carrier recovery circuit. This transmission path characteristic is notified from the base station 100 to the mobile station 200.
  • subcarrier allocation according to the present embodiment will be described with reference to FIGS.
  • the contention channel measurement unit 90 measures the quality of the contention data input from the demodulation unit 70 by measuring the electric field strength described above. In this measurement result, the quality of each band can be measured by obtaining an average value for each band of a predetermined width. The measured quality of each band is notified to the control information generation unit 30 as quality information.
  • the control information generation unit 30 notifies the allocation priority instruction unit 20 of the quality information notified from the contention channel measurement unit 90.
  • the allocation priority instruction unit 20 generates control information. Based on the quality information notified from the section 30, only the bands 310 and 330 with high communication quality are determined to determine the priority with which each radio resource is allocated to each user group.
  • the control information generation unit 30 is notified as the degree information.
  • radio resource allocation section 170 is based on priority information input from message analysis section 140 and is based on data amount determination section 160.
  • the input contention data is assigned to a predetermined radio resource as a contention channel and input to the modulation unit 180.
  • Modulation section 180 performs predetermined modulation processing (DA conversion or the like) on the contention data input from radio resource allocation section 170 and causes RF data to be input to RF section 120.
  • the RF unit 120 transmits the contention data input from the modulation unit 180 to the base station 100 from the antenna 110 after up-converting the contention data to a radio frequency.
  • the base station 100a has described the case where the priority is determined based on the communication quality of each band and is transmitted to the mobile station 200 as priority information.
  • the base station 100a may transmit only the quality information that is the measured communication quality of each band to the mobile station 200.
  • the mobile station 200 may transmit contention data using only the bands 310 and 330 based on the received quality information.
  • FIG. 12 is a diagram showing subcarrier allocation in the radio communication system according to the present embodiment.
  • FIG. 12 shows a case where nine subcarriers 1 to 9 are assigned to three types of user groups A to C.
  • Subcarriers 1 to 3 belong to band 310 with high communication quality
  • subcarriers 4 to 6 belong to band 320 with low communication quality
  • subcarriers 7 to 9 belong to band 330 with high communication quality.
  • subcarriers 1 to 3 and 7 to 9 have a relatively high priority of 1 to 6
  • subcarriers 4 to 6 have a relatively high priority of 7 to 9.
  • FIG. 13 is a diagram showing subcarrier allocation in FIG. 12, where the communication quality differs depending on not only the frequency but also the user group.
  • subcarriers 1 to 3 that is, band 310
  • user groups A and C have high communication quality and user group B has low communication quality.
  • subcarriers 4 to 6 that is, band 320
  • user group B User groups A and C have high communication quality
  • user groups A to C have high communication quality in subcarriers 7 to 9 (that is, band 330) where communication quality is low.
  • the subcarriers 4 to 6 have a relatively high priority for user B group 1 to 3 and a relatively low priority for user A and group C 7 to 9.
  • subcarriers 1 to 3 set the priority of user group B to 7 to 9 and relatively low. Then, according to FIG. 7, the priorities of the user groups A to C are set in the bands 310 and 330 having high communication quality for the users A and C and the bands 320 having low communication quality for the users A and C, respectively. Established in accordance with prescribed rules to ensure equality throughout.
  • FIG. 14 is a block diagram showing functions of the base station 10 Ob when subcarriers in OFDM are used as radio resources.
  • FIG. 14 is a diagram in which a transmission path estimation unit 91 and a radio resource allocation unit 92 are interposed between the demodulation unit 70 and the modulation unit 40 in FIG. 10 (some are omitted for convenience of illustration). )
  • an RF unit 50 includes a down-converter 51 and a modulator 40 for down-converting contention data received from the antenna 60 into an analog baseband signal and then inputting the content data to the demodulator 70. And an up-conversion unit 52 for transmitting from the antenna 60 after up-converting the control information input from the radio frequency to the radio frequency
  • the demodulator 70 converts the analog data output from the RF unit 50 into digital data (serial data) (not shown) and the serial data output from the AD converter as parallel data.
  • the serial Z parallel conversion unit 71 that converts and outputs the data, and the parallel data output from the serial Z parallel conversion unit 71 is subjected to a predetermined demodulation process by applying FFT to a plurality of radio resources R (1) to R And an FFT unit 72 for outputting as (N).
  • the modulation unit 40 performs a predetermined modulation process by performing IFFT (Fast Inverse Fourier Transform) on the plurality of radio resources R (1) to R (N) output from the radio resource allocation unit 92, and performs parallel processing.
  • IFFT Fast Inverse Fourier Transform
  • IFFT unit 42 for output as data
  • serial Z parallel conversion unit 41 that converts parallel data output from IFFT unit 42 into serial data and outputs it
  • serial data output from serial Z parallel conversion unit 41 Digital data
  • the predetermined modulation processing is not limited to IFFT, but may be IDFT (discrete inverse Fourier transform).
  • the predetermined demodulation process is not limited to FFT but may be DFT.
  • the FFT unit 72 performs OFDM demodulation processing by performing FFT on the parallel data input from the serial Z parallel conversion unit 71, and outputs the result as a plurality of radio resources R (1) to R (N). .
  • Radio resources R (1) to R (N) output from the FFT unit 72 are input to the transmission path estimation unit 91. It is.
  • the transmission path estimation unit 91 estimates the transmission path characteristics of each subcarrier from each of the input radio resources R (1) to R (N) and notifies the radio resource allocation unit 92 of the transmission path characteristics. As described above, this channel characteristic estimation is performed by obtaining a phase difference using a known sequence signal.
  • the radio resource allocation unit 92 allocates radio resources as shown in FIGS. 12 to 13, for example, based on the transmission path characteristics of each subcarrier notified from the transmission path estimation unit 91.
  • FIG. 15 is a flowchart showing an operation of the base station 100b shown in FIG.
  • step S1 the subcarriers are considered without considering both the transmission path characteristics that differ depending on the frequency as described in FIG. 12 and the transmission path characteristics that differ depending on the user group as described in FIG. Determine the priority of. Thereby, for example, the priority of the subcarrier is determined as shown in FIG. Then, the process proceeds to step S2.
  • step S2 it is determined whether or not a plurality of contention data collide with each other in the same subcarrier when contention data is transmitted with the priority determined in step S1. If a collision occurs, the priority determined in step S1 needs to be corrected, so the process proceeds to step S3. If a collision does not occur, the priority determined in step S1 does not need to be corrected. finish.
  • step S3 except for the subcarriers in which no collision occurred in step S2, the transmission path characteristics that differ depending on the frequency as described in FIG. 12 are considered, and the user group as illustrated in FIG. Therefore, the priority of subcarriers is determined without considering different transmission path characteristics. That is, the radio resource allocation unit 92 divides the band including all subcarriers into three bands 310 to 330, and the band 310 to 330 with high communication quality is set to a relatively high priority and the band with low communication quality 320. Sets the priority relatively low. Then, the radio resource allocation unit 92 converts the data to be transmitted to parallel data when the data to be transmitted is serial data (or remains parallel when the data to be transmitted is parallel data), and then proceeds to the IFFT unit 42. Let them enter. As a result, the priority of subcarriers is determined as shown in FIG. Then, the process proceeds to step S4.
  • step S4 when contention data is transmitted with the priority determined in step S3, a plurality of contention data collide in the same subcarrier. Judge whether force. If a collision occurs, the priority determined in step S3 needs to be corrected, so the process proceeds to step S5. If a collision does not occur, the priority determined in step S3 does not need to be corrected. finish.
  • step S5 except for the subcarriers in which no collision occurred in step S4, the transmission path characteristics differ depending on the frequency as described in FIG. 12 and the user group as described in FIG. Therefore, the priority of subcarriers is determined in consideration of different transmission path characteristics! / And deviations.
  • the communication quality is measured for each subcarrier, for example, a group of users assigned priority 1 in a certain band fails in contention data demodulation processing even though contention channel collision does not occur. In such a case, the user group is changed so as to be assigned priority 1 with subcarriers in other bands. Also
  • Each of the user groups A to C determines that the communication quality is low in step S3 (that is, in FIG. 12), and measures transmission path characteristics that differ depending on the user group even in the band 320.
  • the user groups A, B, and C transmit contention data on subcarriers f4, f5, and f6, respectively, in which the priority of the own user group is highest in the band 320.
  • the subcarrier priority is changed as shown in FIG.
  • the transmission path of the subcarriers that did not collide with each other was estimated and the communication quality was measured for each band and each user group, as shown in Fig. 12.
  • the priority can be changed to the priority as shown in FIG. Then go to step S4.
  • contention channel collisions can be easily reduced because allocation is made to an appropriate subcarrier that takes into account different transmission path characteristics depending on the frequency and user group.
  • the subcarriers used as radio resources are duplicated arranged at equal intervals in the frequency domain. It may be specified by subcarrier numbers themselves assigned to several subcarriers (subcarrier sequences) in ascending order from low frequency to high frequency, or specified by subcarrier allocation information including predetermined parameters. May be.
  • FIG. 16 is a block diagram showing functions of base station 100c in the radio communication system according to Embodiment 3.
  • FIG. 16 includes a subcarrier allocation information storage unit 93 that allows the modulation unit 40 to input subcarrier allocation information in FIG. 4 (some are omitted for the sake of illustration).
  • the subcarrier allocation information storage unit 93 stores subcarrier allocation information including predetermined parameters for designating subcarriers used as radio resources.
  • the subcarrier allocation information input from the subcarrier allocation information storage unit 93 is subjected to a predetermined modulation process in the modulation unit 40 and input to the RF unit 50.
  • the RF unit 50 up-converts the subcarrier allocation information input from the modulation unit 40 to a radio frequency by a built-in up-conversion unit (not shown in FIG. 16), and then transmits the antenna 60 power to the mobile station 200 as well. .
  • RF section 120 receives subcarrier allocation information transmitted from base station 100c from antenna 110, down-converts it to an analog baseband signal, and then to demodulation section 130. Let them enter.
  • Demodulation section 130 performs predetermined demodulation processing (AD conversion or the like) on the subcarrier allocation information input from RF section 120, and inputs it to message analysis section 140.
  • the message analysis unit 140 extracts predetermined parameters included in the subcarrier allocation information by analyzing the subcarrier allocation information input from the demodulation unit 130. Then, based on this predetermined parameter or the like, a subcarrier number itself used as a radio resource is calculated and input to radio resource allocation section 170. As shown in FIG.
  • the subcarrier allocation information may use a control channel associated with the data channel.
  • I ch is used as a data channel for accommodating broadcast information (received from base station 100 when mobile station 200 is in a waiting state), synchronization information, etc.
  • Q-ch is assigned to subcarriers. Used as a control channel for storing information. This is similar to using I-ch as DPDCH and Q-ch as DPCCH when using I-ch as a data channel in W-CDMA.
  • the subcarrier allocation information is not limited to this, It may be housed in Ich as the above information.
  • FIG. 18 is a diagram showing a first aspect of designation of subcarriers in the radio communication system according to the present embodiment.
  • subcarriers fl to f 32 constitute a subcarrier train according to the present invention. Further, subcarriers fl, f5, f9, fl3, fl7, f21, f25, and f29 are resource subcarriers according to the present invention, and constitute a resource subcarrier sequence.
  • FIG. 19 is a diagram showing a second aspect of radio resource designation in the radio communication system according to the present embodiment.
  • the second mode operations similar to those in the first mode are performed except for the parameters and the arithmetic expression, and the same effects are obtained.
  • contention channel collisions can be reduced by setting the priority of subcarrier allocation.
  • FIG. 20 is a diagram showing a third aspect of radio resource designation in the radio communication system according to the present embodiment.
  • a third aspect is characterized in that, in the first aspect, the subcarriers are composed of a plurality of sets.
  • the first subcarrier number Sa 26 and subcarrier
  • subcarriers fl to f32 constitute a subcarrier train according to the present invention.
  • subcarriers fl, f5, f9, fl3, f26, f28, f30, and f32 are resource subcarriers according to the present invention, and constitute a resource subcarrier sequence.
  • subcarriers fl, f5, f9, and f13 and subcarriers f26, f28, f30, and f32 each constitute a first resource subcarrier sequence according to the present invention.
  • the number of sets is 2 and the first set and the second set are separated has been described, but the number of sets is not limited to 2, and may be 3 or more.
  • the pairs may partially overlap.
  • more various subcarrier sequences can be designated by the arithmetic expression.
  • the frequency band required for the resource subcarrier train (the difference between the highest frequency and the lowest frequency of all resource subcarriers contained in the resource subcarrier train) becomes wide, the frequency of multipath fading increases. In such a case, by increasing the number of sets and reducing the number of subcarriers per set, it becomes possible to narrow the frequency band per set and reduce the effect of multipath fading.
  • subcarriers are recognized as being arranged irregularly when specified by the subcarrier number itself, they should be divided into a plurality of groups according to a predetermined rule (calculation formula). Therefore, these can be recognized regularly for each set and FFT and IFFT can be performed collectively. Thereby, processing can be facilitated.
  • the power described in the case where all subcarriers are specified by an arithmetic expression ie, by subcarrier allocation information
  • only a part of the subcarrier sequence is subcarriers. It may be specified by allocation information, and the rest may be specified by the subcarrier number itself.
  • the wireless communication system and the wireless communication method according to the present embodiment! Therefore, the subcarrier to be used as the radio resource is designated not by the subcarrier number itself but by subcarrier allocation information including predetermined parameters. Therefore, the amount of information related to the combination of radio resources to be transmitted and allocated can be reduced. Therefore, the amount of data to be transmitted from the base station 100 to the mobile station 200 can be reduced.
  • the arithmetic expression used in the present embodiment is not limited to that described above, and may be any expression that can express the subcarrier number of the subcarrier sequence used as a radio resource.
  • All subcarriers to be used as radio resources have bandwidth, etc.! / Although it may be different, it may have partially different bandwidths.
  • FIG. 21 is a diagram illustrating designation of subcarriers in the wireless communication system according to the fourth embodiment.
  • subcarriers fl to f26 include a first set of subcarriers fl to f14 having a relatively narrow bandwidth and a subcarrier f having a relatively wide bandwidth. It is divided into a second group consisting of 15 to f18 and a third group consisting of subcarriers fl9 to f26 having a relatively narrow bandwidth. Within each set, each subcarrier has the same bandwidth. Also, the bandwidth of subcarriers fl to fl4 and the bandwidth of subcarriers fl9 to f26 may be the same or different. In FIG.
  • subcarriers fl, f5, f9, and f13 of the first set of subcarriers fl to fl4 are used as radio resources
  • all of subcarriers fl5 to fl8 of the second set of subcarriers fl5 to fl8 are used.
  • subcarriers f20, f22, f24, and f26 among the third set of subcarriers fl9 to f26 are used as radio resources.
  • subcarriers fl, f5, f9, f13 and subcarriers The rear f20, f22, f24, and f26 each form a second resource subcarrier sequence according to the present invention, and the subcarriers fl5 to fl8 configure a third resource subcarrier sequence according to the present invention.
  • FIG. 22 is a block diagram showing functions of base station lOOd in the wireless communication system according to the fourth embodiment.
  • FIG. 22 shows a subcarrier division information storage unit 94 for inputting the subcarrier division information to the control information generation unit 30 in FIG. 4 and shows the function of the demodulation unit 70 in more detail (for convenience of illustration). Above, some are omitted).
  • the demodulator 70 includes an AD converter (not shown), one serial Z parallel converter 71 connected to the AD converter, and three FFT units connected to the serial Z parallel converter 71. 72a, 72b, 72c and force are also constructed.
  • the subcarrier division information storage unit 94 stores subcarrier division information for dividing a subcarrier used as a radio resource into a plurality of sets.
  • This subcarrier division information includes the bandwidth of each set of subcarriers, the top subcarrier number of each set, and the total number of subcarriers in each set.
  • the control information generation unit 30 generates the subcarrier division information input from the subcarrier division information storage unit 94 as control information in a wireless format, and inputs the control information to the modulation unit 40.
  • the modulation unit 40 performs a predetermined modulation process on the control information input from the control information generation unit 30 and inputs the control information to the RF unit 50.
  • the RF unit 50 up-converts the control information input from the modulation unit 40 to a radio frequency using a built-in up-conversion unit (not shown in FIG. 22), and then transmits the control information from the antenna 60 to the mobile station 200.
  • RF section 120 receives control information transmitted from base station 100 from antenna 110, down-converts it to an analog baseband signal, and then inputs it to demodulation section 130.
  • the demodulation unit 130 performs predetermined demodulation processing (AD conversion or the like) on the control information input from the RF unit 120 and inputs the control information to the message analysis unit 140.
  • the message analysis unit 140 extracts the subcarrier division information by analyzing the control information input from the demodulation unit 130, and uses the subcarrier fl to f26 using the method described in the third embodiment. 2nd subcarrier division information including subcarrier numbers used as radio resources and the first to third sets of bandwidths is generated and input to radio resource allocation section 170.
  • the radio resource allocation unit 170 is a message analysis unit 140.
  • the content data input from data amount determination section 160 is assigned to a predetermined subcarrier as a contention channel and input to modulation section 180 based on the second subcarrier division information input from the above.
  • Modulation section 180 performs predetermined modulation processing (DA conversion or the like) on the contention data input from radio resource allocation section 170 and causes RF data to be input to RF section 120.
  • the RF unit 120 transmits the antenna 110 force to the base station 100 after up-converting the contention data input from the modulation unit 180 to a radio frequency.
  • RF unit 50 receives contention data transmitted from mobile station 200 from antenna 60, and performs analog conversion with a built-in down-conversion unit (not shown in Fig. 22). After down-converting to baseband signal, input to demodulator 70.
  • the demodulator 70 performs a predetermined demodulation process (AD conversion, etc.) on the contention data input from the RF unit 50 using an AD converter (not shown) to convert the content data into digital data (serial data). Input to 71.
  • the serial Z parallel conversion unit 71 based on the second subcarrier division information, transfers content data related to the first set of subcarriers fl, f5, f9, and fl3 to the FFT unit 72a and the first data of subcarriers fl5 to f18.
  • the content data for the second set is input to the FFT unit 72b, and the content data for the third set of subcarriers f20, f22, f24, and f26 is input to the FFT unit 72c.
  • the bandwidth when the bandwidth is wide, interference with other base station power can be received by reducing the signal transmission speed and reducing the coding rate. Therefore, the interference from other base stations is large! / In the frequency band, the bandwidth may be widened like subcarriers f15 to f18.
  • subcarrier f 14 located at the boundary between the first set and the second set and subcarrier f 19 located at the boundary between the second set and the third set are different because they are not used as radio resources.
  • a center frequency difference is provided between the groups having frequencies. This makes it possible to reduce interference between groups.
  • FIG. 23 is a block diagram illustrating functions of the demodulator 70a when subcarriers in OFDM are used as radio resources.
  • FIG. 23 shows the demodulator 70 shown in FIG. 22 in which the despreading units 73a to 73c are connected to the FFT units 72a to 72c, respectively (parts are omitted for the sake of illustration). ).
  • Increasing the spreading factor is to lengthen the spreading code multiplied by the despreading units 73a to 73c, so that it corresponds to narrowband subcarriers fl, f5, f9, fl3 based on the second subcarrier division information
  • the despreading unit 73a shortens the spreading code
  • the despreading unit 73b corresponding to the wideband subcarriers fl5 to fl8 lengthens the spreading code to narrowband subcarriers f20, f22, f24, and f26.
  • the corresponding despreading unit 73c lengthens the spreading code.
  • the spreading factor in despreading sections 73a to 73c is reported from base station 100 to mobile station 200 using a broadcast channel or the like. After receiving the spreading factor and the subcarrier division information, the mobile station 200 transmits the contention channel to the base station 100 based on these information.
  • the serial Z-parallel converter 71 performs content data on the first set of subcarriers fl, f5, f9, fl3 based on the second subcarrier division information.
  • Input to 72c This avoids using subcarrier fl4 located at the boundary between the first group and the second group and subcarrier fl9 located at the boundary between the second group and the third group as radio resources to reduce interference between the groups. It becomes possible to do.
  • since the transmission speed of signals in a frequency band with large interference can be reduced, it is possible to receive interference from other base stations.
  • the subcarrier sequence is divided into a plurality of sets according to the bandwidth. Therefore, in a frequency band where interference from other base stations is large, a plurality of bandwidths different from one base station 100 are used by expanding the bandwidth and reducing the coding rate or increasing the spreading factor. It is possible to communicate with the mobile station 200 while reducing interference. Therefore, it is possible to reduce the number of transmissions of the data amount of a preamble signal such as a Pilot signal transmitted to measure a phase shift due to interference. Thus reducing the power used Can. Also, different OFDs with different bandwidth subcarriers
  • contention channel collisions can be reduced by setting the priority of subcarrier allocation, as in the first embodiment.

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Abstract

La présente invention concerne un système et un procédé de communication sans fil dont l’objectif est de réduire facilement le taux de collision d’un canal de contention. En vue d’atteindre cet objectif, il est prévu que la commande d’attribution de la ressource sans fil soit différente entre une communication sans fil et une autre communication sans fil.
PCT/JP2005/018139 2005-09-30 2005-09-30 Système et procédé de communication sans fil WO2007043108A1 (fr)

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EP05788284A EP1940059A4 (fr) 2005-09-30 2005-09-30 Système et procédé de communication sans fil
PCT/JP2005/018139 WO2007043108A1 (fr) 2005-09-30 2005-09-30 Système et procédé de communication sans fil
CN200580051734.1A CN101273565B (zh) 2005-09-30 2005-09-30 无线通信系统及无线通信方法
JP2007539732A JP4602409B2 (ja) 2005-09-30 2005-09-30 無線通信システムおよび無線通信方法
US12/065,968 US9065596B2 (en) 2005-09-30 2005-09-30 Wireless communication system and wireless communication method

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US9065596B2 (en) 2015-06-23
US20080227475A1 (en) 2008-09-18
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EP1940059A4 (fr) 2011-09-07

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